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Finding the Fourth Proportional to 1,509.63, 2,082.20 and 920.19

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Solution

The fourth proportional to 1,509.63, 2,082.20 and 920.19 is: 1,269.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,509.63 : 2,082.20 = 920.19 : x
  2. Step 2: Convert to fraction form
    1,509.63/2,082.20 = 920.19/x
  3. Step 3: Cross multiply
    1,509.63x = 2,082.20 × 920.19
  4. Step 4: Simplify right side
    1,509.63x = 1,916,019.62
  5. Step 5: Solve for x
    x = 1,916,019.62/1,509.63
  6. Step 6: Final answer
    x = 1,269.20

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,510.63, 2,083.58 and 921.19
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.